If acid gets on the skin or clothing, wash it off with a large amount of water, then neutralize it with a 2% solution

| March 17, 2021 | education

If acid gets on the skin or clothing, wash it off with a large amount of water, then neutralize it with a 2% solution of Na2HCO3 (baking soda), calculate the mass of sodium hydrogen carbonate necessary to prepare a solution weighing 200 g with a mass fraction of 2% In the laboratory or in everyday life at contact of alkali on the skin at the beginning, quickly wash off the alkali with a stream of cold water, then treat with 2% acetic acid CH3COOH solution, then rinse again with cold water. Find the mass of acetic acid required to prepare 300 g of solution.

Given:

a) W (NaHCO3) = 2%

m (solution) = 200g

W (CH3COOH) = 2%

m (solution) = 300 g

a) m (NaHCO3) -?

b) m (HCOOH) -?

Decision:

A)

Let’s calculate how much soda you need to take to prepare the solution.

W = m (substance): m (solution) × 100%, hence

m (substance) = (m (solution) × W): 100%.

m (substance) = (200 g × 2%): 100% = 4 g.

B)

Find the mass of acetic acid.

m (substance) = (300 g × 2%): 100% = 6 g.

Answer: 4d; 6 g



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